Study of UWB adaptive bit loading in time varying channel

Abstract

This paper aims to study the performance of implementing adaptive modulation in Multiband Orthogonal Frequency Division Multiplexing Ultra Wideband (MB OFDM UWB) system. MB OFDM UWB technology has the potential of replacing other wireless technologies within the Personal Area Networks (PANs). Currently MB OFDMUWB devices operate below the expected performance which is largely due to its EIRP limit and frequency selective fading. This bottle neck can be reduced by implementing adaptive modulation in the system. In this Paper, channel measurement of different scenarios has been carried out. The scenarios are model of realistic environment where UWB devices will operate. Effects of different number of human subjects in various movement patterns are studied. The result show implementing exhibit that implementing adaptive modulation in UWB system enhances the performance of the system.